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Finding the Fourth Proportional to 111,163.20, 166,821.60 and 80,020.80

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Solution

The fourth proportional to 111,163.20, 166,821.60 and 80,020.80 is: 120,086.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,163.20 : 166,821.60 = 80,020.80 : x
  2. Step 2: Convert to fraction form
    111,163.20/166,821.60 = 80,020.80/x
  3. Step 3: Cross multiply
    111,163.20x = 166,821.60 × 80,020.80
  4. Step 4: Simplify right side
    111,163.20x = 13,349,197,889.28
  5. Step 5: Solve for x
    x = 13,349,197,889.28/111,163.20
  6. Step 6: Final answer
    x = 120,086.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.